The glass-forming ability （CFA） and magnetic properties of the Cd50 Co50-based amorphous alloy with AI addition substitution for Co are investigated. It is found that the CFA and magneto-caloric effect of the Gd50Co...The glass-forming ability （CFA） and magnetic properties of the Cd50 Co50-based amorphous alloy with AI addition substitution for Co are investigated. It is found that the CFA and magneto-caloric effect of the Gd50Co45Al5 amorphous alloy are better than Cd50Co50 amorphous alloy. The maximum magnetic entropy change （-△ Sm^peak） and the magnetic refrigerant capacity- of the amorphous alloy under a field of 5 T are about 6.64 J·kg^-1 K^-1 and 764 J·kg^-1, respectively. The field dependence of magnetic entropy change meets the one predicted by the mean field theory, which is investigated for a better understanding of the magneto-caloric behaviors of the Gdso Co45Al5 amorphous alloy.展开更多
The alloying effects of the like-atom substitution of Ni and Co for Fe on the various properties of Fe_（70）B_（16.7）Si_（8.3）Ta_5 metallic glass are investigated in this present work. New Fe-based bulk glassy allo...The alloying effects of the like-atom substitution of Ni and Co for Fe on the various properties of Fe_（70）B_（16.7）Si_（8.3）Ta_5 metallic glass are investigated in this present work. New Fe-based bulk glassy alloys, namely Fe_（60–x）Co_xNi_（10）B_（16.7）Si_（8.3）Ta_5（at.%;x = 10, 20 and 30） with critical diameters up to 1.5 mm, were made by means of copper mold casting.A new glass-forming ability indicator, viz., the enthalpy of supercooled liquid, has been introduced for assessment of the glass-forming abilities（GFAs） of these Fe-based multi-component alloys. Nano-indentation results indicate that the calculated elastic modulus and hardness of the bulk glassy alloys are lower than those of the Fe_（70）B_（16.7）Si_（8.3）Ta_5 alloy.Among these bulk glassy alloys, Fe_（70）B_（16.7）Si_（8.3）Ta_5 exhibits the large elastic modulus and hardness with values of 178 ± 1GPa and 12.9 ± 0.1 GPa, respectively. All the bulk glassy alloys exhibit good soft magnetic properties with high saturation magnetization Bs^0.75–1.04 T but low coercive force Hc^0.2–5.2 A/m.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 51171100 and 51271103the Research Grants Council of the Hong Kong Special Administrative Region under Grant No PolyU511212
文摘The glass-forming ability （CFA） and magnetic properties of the Cd50 Co50-based amorphous alloy with AI addition substitution for Co are investigated. It is found that the CFA and magneto-caloric effect of the Gd50Co45Al5 amorphous alloy are better than Cd50Co50 amorphous alloy. The maximum magnetic entropy change （-△ Sm^peak） and the magnetic refrigerant capacity- of the amorphous alloy under a field of 5 T are about 6.64 J·kg^-1 K^-1 and 764 J·kg^-1, respectively. The field dependence of magnetic entropy change meets the one predicted by the mean field theory, which is investigated for a better understanding of the magneto-caloric behaviors of the Gdso Co45Al5 amorphous alloy.
基金supported by the National Natural Science Foundation of China(Nos.51671045 and 51601073)the State Key Laboratory of Solidification Processing in NWPU(No.SKLSP201607)the Start-up Cost in Jiangsu University of Science and Technology(No.1062931608)
文摘The alloying effects of the like-atom substitution of Ni and Co for Fe on the various properties of Fe_（70）B_（16.7）Si_（8.3）Ta_5 metallic glass are investigated in this present work. New Fe-based bulk glassy alloys, namely Fe_（60–x）Co_xNi_（10）B_（16.7）Si_（8.3）Ta_5（at.%;x = 10, 20 and 30） with critical diameters up to 1.5 mm, were made by means of copper mold casting.A new glass-forming ability indicator, viz., the enthalpy of supercooled liquid, has been introduced for assessment of the glass-forming abilities（GFAs） of these Fe-based multi-component alloys. Nano-indentation results indicate that the calculated elastic modulus and hardness of the bulk glassy alloys are lower than those of the Fe_（70）B_（16.7）Si_（8.3）Ta_5 alloy.Among these bulk glassy alloys, Fe_（70）B_（16.7）Si_（8.3）Ta_5 exhibits the large elastic modulus and hardness with values of 178 ± 1GPa and 12.9 ± 0.1 GPa, respectively. All the bulk glassy alloys exhibit good soft magnetic properties with high saturation magnetization Bs^0.75–1.04 T but low coercive force Hc^0.2–5.2 A/m.
